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Test whether string is a valid integer
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184
[[ $var =~ ^-?[0-9]+$ ]]
The ^ indicates the beginning of the input pattern
The - is a litera...
How to read from standard input in the console?
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edited Jan 3 '14 at 2:59
answered Jan 3 '14 at 2:42
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CMake not able to find OpenSSL library
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324
I had the same problem (openssl) and this worked for me on Ubuntu 14.04.1 LTS. The solution is t...
Put icon inside input element in a form
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406
The site you linked uses a combination of CSS tricks to pull this off. First, it uses a backg...
Difference between static class and singleton pattern?
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edited May 24 '17 at 11:09
systemovich
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Jenkins Git Plugin: How to build specific tag?
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224
I was able to do that by using the "branches to build" parameter:
Branch Specifier (blank for d...
Is there a “do … while” loop in Ruby?
... BryanH
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answered May 23 '12 at 5:28
Siwei Shen 申思维Siwei Shen 申思维
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Why are two different concepts both called “heap”?
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Donald Knuth says (The Art of Computer Programming, Third Ed., Vol. 1, p. 435):
Several authors began about 1975 to call the pool of available memory a "heap."
He doesn't say which authors and doesn't give references to any specific papers, but does say that the use of the term "heap" in rela...
How can we programmatically detect which iOS version is device running on? [duplicate]
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684
Best current version, without need to deal with numeric search within NSString is to define macr...